(at: number)
| 328 | }) |
| 329 | |
| 330 | const loop = (at: number) => { |
| 331 | if (document.visibilityState !== "visible") { |
| 332 | raf = 0 |
| 333 | return |
| 334 | } |
| 335 | |
| 336 | if (last === 0) { |
| 337 | last = at |
| 338 | raf = requestAnimationFrame(loop) |
| 339 | return |
| 340 | } |
| 341 | |
| 342 | fps.push({ at, dur: at - last }) |
| 343 | last = at |
| 344 | |
| 345 | if (at - snap >= 250) { |
| 346 | snap = at |
| 347 | syncFrame(at) |
| 348 | } |
| 349 | |
| 350 | raf = requestAnimationFrame(loop) |
| 351 | } |
| 352 | |
| 353 | const stop = () => { |
| 354 | if (raf !== 0) cancelAnimationFrame(raf) |